Home / 388.50-490.75

Finding the Third Proportional to 388.50 and 490.75

Calculator

Solution

The third proportional to 388.50 and 490.75 is: 619.91

Step by Step Solution

  1. Step 1: Write the proportion equation
    388.50 : 490.75 = 490.75 : x
  2. Step 2: Convert to fraction form
    388.50/490.75 = 490.75/x
  3. Step 3: Cross multiply
    388.50x = 490.75 × 490.75
  4. Step 4: Simplify right side
    388.50x = 240,835.56
  5. Step 5: Solve for x
    x = 240,835.56/388.50
  6. Step 6: Final answer
    x = 619.91

Related Problems

Find third proportional to 194.25 and 245.38
Half scale
Find third proportional to 777 and 981.50
Double scale
Find third proportional to 391 and 493
Similar ratio
Find third proportional to 582.75 and 736.13
1.5x scale

Why These Related Problems?

These problems maintain the same ratio (1.26) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.